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I would think it depends on the type of tungsten, I weld mostly stainless so I use red band which usually never gets red when I grind it, now my green band tungsten does but it hasn't affected my welding

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It get's way hotter than that when welding with it. And you reuse it for more than one welding session. So in light of that, anything you do to it with a grinding wheel (as far as heat is concerned) isn't going to damage it in any way.